Superheating in high-pressure locomotives



SUPE'I-YETING IN HIGH PESSURE LOCOMOTIVES 7 sheets-sheet Filed Oct) SUPEEHER'ING IN HIGH PRESSURE LGGOMOTIVES Film oct. 27, '192s sheetwsheer 2 June 24, i939. o. H, HAMM/ANN v RHEATING IN HIGH PRESSURE LOCOMOTVES Filed Oct. 27, 1928 '7 Sheets-Sheet 5am@ 243, 1936. o. H. HARTMANN 'fg-Q SUPERHEATNG N HIGH PRESSURE LOCMOTIVES Filed 001.27, 1928 7 shams-sheet 4 www@ . .Same 24, o. H. HARTMANN SUPERHEATING IN HIGH PRSSURE LOCOMOTIVES Filed oci. 27, 1928 7 sheeiS-.sheet Jun@ "i930,

C. H. HARTMAN@ SUPERHEATINC- IN HIGH PRESSURE LOCOMOTIVES Filed om. 27, 192s Eg. je.

fm @fm o. H. HARTMANN l @68,319

SUPERHEATING IN HIGH PRESSURE LOCOMOTIVES jun@ 24, 1936.

vFiled oct. 27, 192:3 v7 sheets-smet 7 Patented June ,24, 193()V UNITED STAT OTTO H. HARTMANN, OF CASSEL-WILHELMSOHE, GERMANY, ASSIGNOR T0 SCHMIDT- i i SGHE HEISSDAMPF-GESELLSCHAFT M. B. H., OF CASSELWILHELMSHOHE, GEB-1 Maui; A CORPORATION or GERMANY SUPEREATING 1N HIGH-PRESSURE VLoooiuo'rrvii's Apjmcauqn med' october 27, 192s, serial No. 315,557, and in Germany August 1, mas.

built as .two-pressure locomotives, with al( steam- `in the case of indirect'steam generatlon and water-tube boiler generating heatin high-pressure working steam in the case of direct steam generation, followed by the usual smoke-tube'. boiler serving as a lowpressure boiler and4 receivlng the furnacegases from the high-pressure boiler, an advantageous solution of the superheating problem is readily obtainable, inasmuch. as the smoke tubes of the longitudinal boller can accommodate the tube elementssof 'the usual smoketube Jsuperheater both for the high-pressure vand also for sections of the4 boiler. V l

If, however, in such a two-pressure loco7 motive, it is desired to increase the proportion of high-pressure steam to 4such an extent that the low-pressure boiler generates only a small\ quantity of low-pressure steam in certain circumstances so small a quantity that at low and moderate loads the lowpressure boiler serves chieiiy or even` solely as a feed-water heater, so that in the latter case the locomotive works with only highpressure steam) the opportunity mentioned above of obtaining a favourable' solution of the superheat-ing problem does not occur.

A known and approximate solution is then to interpose the superheater and/orl presuperheater and re-superheater in the fur- A nace flue between the steam-generating and the feed-heater sections of the boiler. Such an arrangement', however, has the essential disadvantage that, especially at low loads, an

insutlicient superheat is obtained, since the steam-generating section of the boiler has reduced the hot gases to too low a temperature before they reach th'e 'superheaten A higher superheat can be obtained by arranging the superheater nearer the furnace, i. e., not behind "but among the groups of steam-generating tubes, but with this Aarrangement there is a vconsiderable danger, especially' when steam is suddenly shutv off the low-pressure and the en ne stopped, that the superheater i. tubes will ecome--red hotland yin tune burn through.

According to the difficulty-is overcome elements'of one ormore superheaters, (preresent invention, they y arranging the tube superheaters or re-superheaters) so thatthe.

-lengths of superheater tube pass between 'ornterleave the series of steam-generating tubes in transverse planes, that is, in planes transverse to the direction oflow ofthe hot gases. Y

' With suchl an arrangement, a high degree f of superheat is obtained since the superheater tubes lie in a hot zone ofvthelfurnace' gases I whil'e at the same'time these tubes are prosliutting olf steam.

steam-superheating tubes packed together `in this way, a mutual reaction of the two sets of tues occurs whichl is not present if the super eater is interposed as a whole either between the steam-generating section and the feed-heater section, or .between` two groups of tubes of the steamfgenerating section.l

With the steam-generating tubes and the 'tected from burning through on suddenly 'i If the superheater is shut oi', and in sequence the Atemperature of the tube walls rises, then according to the present, inven' tion, suiicient heat is withdrawn by adjacent steam-generating-tubes'absorbing heat4 -radiated from the superheater tubes `to prevent the latter becoming red hot and burningl through.

Itis not essential, that a superheater element valways y alternates `with a ,series of steam-generating tubes; ifjdesired, for example, a pair of superheater elements may alternate with two series of evaporating.

when the locomotive stops or when there is.

suddenly 4no demand for steam, as for eX- ample when going downhill..

- With the superheater arrangement according to the present invention, transmission of heat and the turbulence of the hot gases are' improved, so that the superheater heating surfaces can be made correspondingly sn1alland light and the important advantage secured of keeping down the weight of the locomotive for a given power. In addition, the superheater elements can be fasily withdrawn and a comparatively uni orm degree of superheating is obtained at all loadsvwithout the necessity of providing adjustable Ibypasses or similar devices.-

tubes may run either The sup'erheating l across the evaporating tubes or parallel to them; In the Hrst case the superheater elewards or downwards;

ments, which preferably take theform of individual serpentines, can be withdrawn laterally, and in the second case, either up- Further, the direction of How of 4the steam through the superheater elements may be `the same as, or opposite or transverse to that of the Hue gases.

In order to avoid an obstruction in the in- '.tervals between the steam-generating water tubes and the superheater tubes, the straight lengths of the serpentines lying next to the furnace are preferably at a greater distance aus apart than the lengths of the serpentines lying further from the furnace (see Fig. 1 o r 3), .so that the ashes can separate and fall down intopthe space below, from which they' are easily removed.

.The boiler 'itself is provided'with an enclosing wall, constructed either out of smooth tubes lying 'close to one another through which water Hows orfout o f ribbed tubes so 4that radiation losses may be reduced as'far.

asl possible andthe wall surfaces operate in va known manner as evaporating l'ieatingy surfaces. l l The construction of the enclosing Wallj from ribbed tubes at the same time makes it possible tovprovide a convenient support by resting the serpentine bends of the supervthe vvvorln'ng steam is effected according to the indirect method by highly superheated live steam.

In all cases itis an essential feature of the invention that the lengths df superheater tube pass among the steam-generating tubes in transverse` planes.

Certain arrangementsof superheaters ac cordlng to the present invention are shown by way of example in the accompanying drawings Figure 1 is a longitudinal sectionthrough a high-pressure locomotive in which high` pressure steam is generated indirectly on a well-known and preferred system,

Figure 2 being a cross-section on the line 2-2 of Figure 1 through y'the interstagle super-heater and the smoke box; j

Figure 3 shows to a larger scale that part of the high-pressure boilercontaining the superheater, the working steam drum being -indicated in chain-dotted lines;

Figure 4 shows likewise to a larger scale a cross-section on the line 4-4 of Figure 3;

Figure-5 shows a cross-section corresponding to Figure 4 of a-modification of the invention as seen from behind looking onthef interstage superheater, Y t Figures 6 to 9 show corresponding views of methods of supporting the superheater serpentines,

Figures 6 and 7 showing-an elevation and planfas seen-from behind, and

' Figures 8 and 9 elevation and plan of the front side on which the superheater serpentines can be` withdrawn;.

Figure 10 shows a longitudinal section through a high-pressure locomotive with dit rect generationof the high-pressureA steam and a modified arrangement of interstage superheater, 4 vFigure 11 being a section on vthe line 11-11 of Figure 10, l Figures 12 and 13 respectively a section on the line 12-12 of Figure 11 and an elevation. of the superheater and of a part of the boiler broken away; n

Figures 14, 1.5 and 16' show a modified form of superheater, l

Figure 14 being a cross-section throughl 'the high-pressure boiler with the superheater in elevation, y

Figure 15 a side view of Figure 14, and Figure 16 a view'from above of a part of a superheater serpentine; while finally llO Figure 1-7 shows a cross-section 4corresponding-to .Figure 4 of another'modification of the invention. y

In Figures'l to 4, the high-pressure section ofthe v.locomotive consists of a heating system forthe Working steam drum, 1, inr which high-pressureusteam, for example, of 60 atmospheres pressure,` isgeneratedi-ndirectly by m'eans of steam at a still` higher pressure,` for example, to 90 atmospheres y l or even by the vapour of aj fluid having a high boiling point.

The heating boileris formed of the fire box and the Hue connected thereto and consists of evaporating tubes, 2, which *formv a I continuous wall and crown for the fire'box and Hue. The part of the Hue adjacent to the'ire. box is traversed by transverse series of uprlght evaporating tubes, 3, connected below to water headers, 4, and above, vas seen in Figure 4, to intermediate. containers, 5, in which the ge erated heating steam colf lects before it enters the heating elements,

13, lying in the water space of the working vsteam drum. From this drum, the working steam passes, for example, at apressure of 60 atmospheres, through the pipe, v6, into a A- verse planesy between the series fof upright l i superheater which consists of the. saturated lsteam header, 7, and the superheated steam header, 8, to'which the superheater serpen tines, 9, are connected, these serpentines, as

seen from the drawings, ypassing in transevaporating tubes, 3.

-The 'high-pressure steam, highly superheated in this superheater, 7, 8, 9, passes through the pipe 10, into the heater, 11, of the interstage superheat-er, 1 2, and aft-er giv-l ing up its superheat to the high-pressure vcylinder exhaust flowing through this inter-- stage superhea-ter,H continues through the pipe, 14, to a-second superheateror re-superheater which similarly to the first superheater consists of steam headers, 7 and 8, and serpentines, 9 lying in transverse planes between ,the series .of upright evaporating tubes, 3. From this re-superheat'er, the

high-pressure steam flows through the pipe, 15, by way ofthe regulating valve, 16, into the valve chest, 18, of the high-pressure cylinder, 19, of the engine. The exhaust stean from this high-pressure cylinder flows ,through the pipe, 20, preferably by way of the non-return Valve,`2 7, into theinterstage superheater, 12, and thence by way` of the valve, 21, into thevalve chest, 23, of' each low-pressure cylinder,- 24 of the engine. (See Figure 2.) v

Between the smoke box, 17, and the ue 'formed by the tube walls, 2, a short smoke tube boiler is operatively arranged', through which all'the feed water passes and which serves primarily as a feed-.water heater for f. the working drum, 1, of the high-pressure 1 boiler. The low-pressure steam, for example of 14 atmospheres, generated in this boiler passes through the pipe, 28, likewise into the interstage superheater, 12, where it ymixes with, the exhaust from the high-pressure cylinder from the pipe, 20, and is superheated in conjunction therewith, the mixture passing by way ofthe regulating valve,-21,

Ythrough the pipe, 22, into the valve chest' ofv each low-pressure cylinder.

As seen from the drawing, the lengths ofsuperheater tubes or serpentines, v9, lie in the part of the boiler 'containing the two` superheaters in transverse planes between the series of evaporating tubes,3, so that if for any reason no steam is passing through the superheater tubes, the latter, without `becoming red hot, can radiate back the heat absorbed from the Vfurnace gases to the ada jacent series of evaporating tubes cooledV from withinV b wateror a mixture lof water and steam n this way it 'is possible yto arrange the'superheater serpentines closer.

-to .the fire-box, and to utilize the very hot' furnace gases in conjunction with a comparatively small superheating surface to obtain aA highdegre'e of supperheat without v.danger of burning the superheater. y p i Figure 5 shows-a form ofthe invention which differs from that. shown in Figures 1 to4 inasmuch astheheating steam for the interstage superheater, 30, corresponding to I the interstage superheater, 12,' of Figure 1,

is takenv from-the intermediate containers,

5. Steam passes romthese through the pipes, 31, into Athe saturated steam header,

7, oft-he superheater9, and after passingV through the latter Hows 'from the superheated g steam header, 8, through the pipe, 32, to-

steam, but a superheater for thefhigh-pres sure working steam and a superheater interposed in abranch of the closed circulating heating system of the high-pressure boiler.

According to a modification of the form shown in Figure 5, the heating steam may b e led from the intermediate containers,.5, d1- rect without previous superheating into the heating serpentines, 33, of the interstage superheater. In this case the boiler section contains only one superheater for ,the

high-pressure working steam between lthe series of evaporating tubes, 3.

Figures 6 to 9 illustrate a method of supi portingfthe superheating serpentines, 9,

To aord the necessary support,A the evaporating tubes, 2, forming the boundary wall on one side of the furnace Hue are provided with ribs, 40, having notches, 41, into which the bends of the superheater serpentines, `9,

fit. On the=opposite side, i. e., 4the side on ,which the superheater elementscan be with-` drawn, the corresponding tubes, 2, are formed without the ribs and the superheater elements areheld in place by clam ing plates, 42, likewise provided with notches for the bends of the superheater serpentine, 9, these plates, 42, being iixed to the individual tubes, such as 2, by`screwed.yokes, 44, secured by nuts. f

, In `the locomotive shown in FigurelO, the high-pressure working steam is generated by the direct methodat a pressure for example for 60 atmospheres in a water-tube boiler which consists' of the steam-andfwater drum,

iso

`50, and the water tubes, 51, which also in lthis case form the Walls and crown of the tire box and are connected together below by water headers, 52.

" evaporating tubes, 53.

The part of the flue connected to the fire box is traversed' by a series of vertical To the water-tube boiler is operatively conv nected thel short W-pressure boiler, 54,

vided into two valves (see Figure 11) with saturated-steam headers, 56, and superheated steam headers, 57, to ,which the superheater serpentines, 58, are connected.

which they are suspended.

In this case, the lengths of superheater tube run parallel to the series of upright evaporating tubes, 53, from the upper partsof Further, the superheater serpentines pass between the series of evaporating tubes, 53, in transverse `planes as in the example of the invention shown in Figures 1 to o. The superheated high-pressure steam passes throughthe pipe, 60, by Wayof the valve, G1, into the valve chest, 62, ofthe high-pressure cylinder, 63.

In 4order to effect the inter-stage superheating of the exhaust steam from the highpressure cylinder and also the superheating of the live 'steam generated in the low-pressure boiler, a superheater of the well-,known smoke-tube type is provided. The exhaust from the high-'pressure cylinder passes .through the pipe, 64, preferably by way of the non-return valve, 75., into the saturated steam header of the smoke-tibesuperheater, 65. The low-pressure steam' generated in the low-pressure boiler, 54, Hows through the pipe, 59, into lthe saturated- 4steam header 'of the second smoke-tube l superheater, 66, vand after being superheated therein passes from `the superheatedsteam header of this superheater by Way of the valve, 67, and a pipe,4 68, into the mixing chamber, 69, into which also flows the superheated high-pressure cylinder exhaust steam from the super-heater, 65', through the pipe, 70. From the chamber, 69, the super- .heated mixture iiowsthrough the pipe, 71,

(shown broken off in Figure 10) into'the valve chests of the--loW-pressure cylinders which are arranged in Figure'2.

A' modified` arrangementv ofthe superheater tubes is shownv in i vofures 14, 15 and 16.

In this form, .the superheater or superheaters, as in the example of the invention 'the same Way as in these headers, as seen in Figure 16,`are bent throughl 900 so that the serpentines, 74, again pass among the series of upright evaporating tubes, 53, in transverse planes, the sameadvantages being in this Way secured as in other constructionall forms of the invention.

Figure 17 shows as a cross-section corresponding to that of Figure 4, a` modification of the superheating arrangements Whenv two superh'eaters are built in between the upright evaporating tubes, 3, the two super.- l heaters -lying in the flue, not in series, but

1n parallel and one above the other so that both are heated to the same extent.

The

steam headers, 76, and 77, with their serpentines, 78,-"constitute for example the presuperheatgfwhile the steam headers, 79- and 80, with their serpentines, 81,eonstitute the `re-superheater.

It is obvious ,thatthe superheater conv structions shown in Figures 11 to and 14 to 16 may also be applied tol a highpressure locomotive generating high-pressure steam by the indirect method vas in- Figure 1,. and conversely, thesuperheater constructions described and shown in this locomotive according to Figures 3', 4 vand 17, may also be applied to a locomotive as 5in Figure 10, generating steam'by the direct. method. .v The superheater constructions vand connections therefor are equally applicable to locomotivesA having two high-pressure cylinders instead ofoner 'What I claim is: f1. In a high-pressure locomotive the combination of `a high-pressure-,Water-tube boiler, a low-pressure-smoke-tube boilerreceiving the furnace flue gases from the highpressure boiler, at least one superheater to superheat thehigh-pressure. steamand at least one superheater to superheat the lowpressure steam, the high-pressure boiler having a series of steam generating Water tubes crossing the channel of iiue gasesand .the

lengths 'of the high-pressure superheater tubes passing between the said series of steam generating Water tubes in planes transverse to the direction of. How of the iue gases. i

2. In a high-pressure locomotive the combination .of a high-pressure-Water-tube boiler, a loW-pressure-smoke tube boiler' receiving the furnace flue gases from the highfpressure boiler, Aat least one superheater "to,

superheat the'h'igh-pressure steam and at least one superheater to superheat the low pressure steam, the high-pressure boiler having series of steamv generatingwater tubesv Aflue gases crossing the channel of'flue gases, the high-r ingseries of steam generating water tubes crossing the channel of iiue gases, the highpressure superheater tubes consisting of removable individual -serpentines'the lengths of which pass between the said series of steam generating water tubes in planes transverse to the direction of flow'of the and the vertical spaces between the l lengths of the individual serpentines situbination o atedlclos'er to the boiler, a low-pressure-smoke-tube boiler receiving the furnace iue gases from the highpressure boiler, at least one superheater to superheat the high-pressure steam, at least one superheater to superheat the lbw-pressure steam, lthe high-pressure boiler having series of steam generating water tubes crossingthe channel of flue gases, the high-pressure superheater tubes consisting of removable individual serpentines the lengths of which passing between the said series of steam generating water tubes in planes transverse to the direction of iiow of the flue gases and water tubes of the high-pressure boiler forming closed walls ofthe flue gas channel,

the saidwatertubes being provided in the region of the removable interleaving superheater serpentines with means to support the bends o f said serpentines. 1

In testimony whereof I have affixed my signature.

OTTO H. HARTMANN.

furnace being greater than the vertical spacesbetween the lengths of the individuall serpentines situated further v from the furnace.

4. In a high-pressure locomotive the coma high-pressure-water-tube boiler, a low-pressure-smoke-tube boiler receiving the furnace flue gases pressure boiler, a superheater to superheat iso the high-pressure steam,

superheat the exhaust steam o f the' highpressure stage of ,'the locomotive engine, a superheater to reheat the high-pressure steam, the two high-pressure steam superheaters consisting of removable individual serpentines the lengths of which passing between series of steam generating water tubes of the high-pressure boiler in .planes transverse to the direction of iow of the iiue ases. 5. In a hi h-pressure locomotive the combination o? a high-pressure-.water-tube boiler, a low-pressure-smoke-tube boiler receiving the furnace iue gases from the higha' superheater to lsuperheat an interstage super-` pressure boiler, the high-pressure sleam, heater heated by t e high-pressure steam to superheat the exhaust steam of the highpressure stage of the locomotive engine, a superheater to reheat the high-pressure steam, the two high-pressure steam superheaters consisting of removable individual serpentines the lengths of which passing between series of steam generating water tubes of the high-pressure boiler in planes transverse to the direction of flow of the flue gases and means to conduct live steam developed from the highan interstage superheater heated by the high-pressure steam to in the -low-pressure-smoke-tube boiler into.

the said interstage superheater.

6. In a high-pressure locomotive the combination of a high-pressure-water-,tube 

